Answers26-27 WHS-Chemistry-1stSixWeeksThe History and Arrangement of the Periodic Table

Writing and Balancing Chemical Equations Answers

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Which statement best describes the properties of metals?

A
They are shiny and bend without breaking.
B
They are dull and are good electrical insulators.
C
They conduct electricity well and are brittle.
D
They can be flattened and do not conduct heat well.
2
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Which statement describes covalent bases?

A
They have hydroxide ions.
B
They produce hydrogen ions.
C
They are often amines.
D
They are named the same as ionic compounds.
3

Lewis structures cannot

A
show the number of valence electrons.
B
show the location of bonds.
C
show the strength of bonds.
D
show how many bonds are present in a molecule.
4

Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding?

A
The valence electrons are easily delocalized.
B
The valence electrons stay in a single orbital.
C
The valence electrons break free of the crystals.
D
The valence electrons move closer to the nuclei.
5

The boron atom of BBr3 has

A
one atomic orbital.
B
two atomic orbitals.
C
three hybrid orbitals.
D
four hybrid orbitals.
6

Which hybrid orbitals would be formed if one s orbital and three p orbitals combined?

A
sp
B
sp2
C
sp3
D
sp4
7

Which formula represents the compound commonly known as phosphine with IUPAC name phosphorus trihydride?

A
PH
B
PH2
C
PH3
D
PH4
8

Which is the Lewis structure for H3PO4?

A
mc013-1.jpg
Option A
B
A central upper P is single bonded left, right, above, and below to upper Os. The O above the P is single bonded to upper H on the left and the right, and has two electron dots above it. The O below the P is single bonded to an H below, and has pairs of electron dots to the left and right.
Option B
C
A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
Option C
D
A central upper P is bonded to an upper H above, an upper O below, and upper O's bonded to upper H's to the left and the right. The O below the P has three pairs of electron dots, to the left, right, and below; the other two O's have pairs of dots above and below. A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
Option D
9

What is the ratio of Al ions to S ions in a neutral compound?

Question illustration
A
1:1
B
2:1
C
2:3
D
3:2
10

What is the chemical formula for zinc (II) phosphate?

A
ZnP
Option A
B
Zn(PO)
Option B
C
Zn(PO)
Option C
D
Zn(NO)
Option D
11

How do ionic bonds affect the properties of ionic compounds?

A
The bonds weakly hold ions together, increasing the melting point.
B
The bonds strongly hold ions together, reducing the boiling point.
C
The bonds prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor.
D
The bonds prevent electrons from moving throughout the crystal, so a solid ionic compound is a good conductor.
12

Which statement is true about ionic compounds?

A
Solid ionic compounds are good conductors of electricity.
B
Ionic compounds have varying solubilities in water.
C
Ionic compounds have very low melting points.
D
Ionic compounds are very easy to bend.
13

An element has six valence electrons available for bonding. Which group of the periodic table does this element most likely belong to?

A
group 2
B
group 4
C
group 16
D
group 18
14

Which reason best explains why metals are shiny?

A
because their valence electrons reflect light
B
because their valence electrons absorb light
C
because their valence electrons oscillate between bands
D
because their valence electrons move to higher energy levels
15

Which element is likely to be the most brittle?

A
selenium
B
cobalt
C
platinum
D
zinc
16

Which is the name for SiO2?

A
silicon dioxide
B
silicon trioxygen
C
disilicon dioxygen
D
monosilicon oxide
17

Which statement describes a molecule that has a trigonal pyramidal molecular shape?

A
The molecule has a trigonal planar electron domain geometry with one lone pair.
B
The molecule has a tetrahedral electron domain geometry with one lone pair.
C
The molecule has a trigonal planar electron domain geometry with two lone pairs.
D
The molecule has a tetrahedral electron domain geometry with two lone pairs.
18

Which compound has the highest melting point?

A
Al2(CO3)3
B
C12H22O11
C
C8H18
D
H2O
19

Based on its location in the periodic table, what can most likely be predicted about phosphorus?

A
It has three valence electrons.
B
It has four valence electrons.
C
It has five valence electrons.
D
It has six valence electrons.
20

Which of the following compounds would be expected to have the strongest ionic bonds?

A
the compound that has the largest ions with the greatest charge
B
the compound that has the largest ions with the least charge
C
the compound that has the smallest ions with the greatest charge
D
the compound that has the smallest ions with the least charge

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